MIL-HDBK-1908B
Subassembly acq. Two or more units which form a portion of an assembly or a unit replaceable as a whole, but having a part or parts which are individually replaceable. (Examples: gun mount stand, window recoil mechanism, floating piston, telephone dial, IF strip, mounting board with mounted parts, power shovel dipper stick.)
Subsystem acq. A combination of sets, groups, etc., which performs an operational function within a system and is a major subdivision of the system. (Examples: Data processing subsystem, guidance subsystem, display subsystem.)
Subtask acq. See "Task analysis."
Support equipment (SE) acq. All equipment required to perform the support function, except that which is an integral part of the mission equipment. SE includes tools, test equipment, automatic test equipment (ATE) (when the ATE is accomplishing a support function), organizational, intermediate, and related computer programs and software. It does not include any of the equipment required to perform mission operations functions.
Symbol dsi. A geometric form or alphanumeric information used to represent the state of a parameter on a display.
Symbol size dsi. Actual symbol size at the display, based on design eye distance from the display, can be calculated using the following formula:
L = 2D tan (a/2)
where: L = size of symbol at the display
D = design eye distance from the display a = symbol subtense (degrees) at D
Example: The breakaway symbol is 100 mrad long. What is the size of the symbol at the display in cm, if the design eye distance is 71 cm (28 inches)?
0.0573
a = 100 mr X
mr = 5.73 degrees
L = 2(71) tan (5.73/2) = 7.11 cm
The same formula can be used for simple magnifier type HUD displays by replacing "D" with the effective focal length of the HUD optics. This formula assumes the angle of incidence of viewing the display is 90 degrees. If it is other than 90 degrees, the symbol size should be increased by
dividing L by the cosine of the angle of deviation from 90 degrees.
System acq. A composite of equipment, skills, and techniques capable of performing or supporting an operational role, or both. A complete system includes all equipment, related facilities, material, software, services, and personnel required for its operation and support to the degree that it can be a
self-sufficient unit in its intended operational environment. (Examples: STINGER, AEGIS, F-15.) When GFE is required for system operation, whether or not operation with GFE occurs in all cases of system operation, that GFE is part of the system.)
System layout drawings acq. System design drawings which include but are not limited to: (a) the configuration and arrangement of items of equipment for manned stations (such as a pilot's station, astronaut's station, launch control officer's station, shipboard command station, and tank commander's station) and multiple crew stations and positions; and (b) the configuration
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